20. the definition of a chemical reation is
A. two chemicals with opposite atoms
B. a chemical with inner electrons
C. any chemical change
D. both a & c
21. fid the equation that is correctly balanced:
A. 2Hl(aq) + 2Pb(NO3)2(aq) --> Pbl2(s) +2HNO3(aq)
B. 2Hl(aq) + Pb(NO3)2(aq) --> Pbl2(s) +2HNO3(aq)
C. Hl(aq) + 3Pb(NO3)2(aq) --> 3Pbl2(s) +2HNO3(aq)
D. 3Hl(aq) + Pb(NO3)2(aq) --> 3Pbl2(s) +2HNO3(aq)
22. find the equation that is correctly balanced:
A. H2SO4(aq) + BaCl2(aq) --> HCl(aq) + 2BaSO4(s)
B. 2H2SO4(aq) + 2BaCl2(aq) --> 4HCl(aq) + BaSO4(s)
C. H2SO4(aq) + 2BaCl2(aq) --> 2HCl(aq) + 2BaSO4(s)
D. H2SO4(aq) + BaCl2(aq) --> 2HCl(aq) + BaSO4(s)
23. write a balanced chemical equation for the reaction described: aluminum metal + hydrochloric acid aluminum chloride solution + hydrogen.
A. Al(s) + 3HCl(aq) --> AlCl3(aq) + 3H2(g)
B. 2Al(s) + HCl(aq) --> 2AlCl3(aq) + H(g)
C. 2Al(s) + 6HCl(aq) --> 2AlCl3(aq) + 3H2(g)
D. 4Al(s) + 12HCl(aq) --> 4AlCl3(aq) + 3H(g)
2007-09-27 03:14:02 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry